Enabling APC for performance improvement

APC (Alternative PHP Cache) is an opcode cache that can significantly speed up your PHP applications, by caching both PHP code and user variables. Adding APC to an application usually results in improved application response times, reduced server load and happier users.

Install dependencies:
apt-get install libpcre3-dev

Install apc (a current version):
pecl install apc

Note where apc.so is installed to:

find / -name apc.so 2>/dev/null

Find the php.ini file so you can update it:

find / -name php.ini 2>/dev/null

Edit php.ini with your favorite editor:

nano /pathTo/php.ini 

Somewhere in you php.ini file add please not that path may be different for you installation

extension="/usr/pathTO/php/modules/apc.so"

apc.enabled=1

Copy the shipped apc.php to see what is going on wit apc on your server

cp /usr/share/pear/apc.php /root_dir_of_your_web_app

Restart you ownCloud server:

sudo /etc/init.d/apache2 restart

Run through your ownCloud site using a browser.

Examine the performance of your cache via browser (confirms APC working):

http://hostname:port/owncloud/apc.php

To validate from the command line:

$ php --ri apc

apc

APC Support => enabled

Version => 3.1.13

APC Debugging => Disabled

MMAP Support => Enabled

MMAP File Mask =>  

Locking type => pthread read/write Locks

Serialization Support => php

Revision => $Revision: 327136 $

Build Date => Mar 22 2013 19:36:36

Directive => Local Value => Master Value

apc.enabled => On => On

apc.shm_segments => 1 => 1

apc.shm_size => 32M => 32M

apc.include_once_override => Off => Off

apc.num_files_hint => 1000 => 1000

apc.user_entries_hint => 4096 => 4096

apc.gc_ttl => 3600 => 3600

apc.ttl => 0 => 0

apc.user_ttl => 0 => 0

apc.mmap_file_mask => no value => no value

apc.filters => no value => no value

apc.cache_by_default => On => On

apc.file_update_protection => 2 => 2

apc.enable_cli => On => On

apc.max_file_size => 1M => 1M

apc.stat => On => On

apc.canonicalize => On => On

apc.stat_ctime => Off => Off

apc.write_lock => On => On

apc.slam_defense => On => On

apc.report_autofilter => Off => Off

apc.rfc1867 => Off => Off

apc.rfc1867_prefix => upload_ => upload_

apc.rfc1867_name => APC_UPLOAD_PROGRESS => APC_UPLOAD_PROGRESS

apc.rfc1867_freq => 0 => 0

apc.rfc1867_ttl => 3600 => 3600

apc.coredump_unmap => Off => Off

apc.preload_path => no value => no value

apc.file_md5 => Off => Off

apc.use_request_time => On => On

apc.lazy_functions => Off => Off

apc.lazy_classes => Off => Off

apc.serializer => default => default